To understand the radiation from vibrating structures is fundamental for the design of quite machines or efficient sound sources. 
One fundamental idea is that the radiation can be composed of different components the so-called fundamental sources.
We talking about monopole sources, dipole sources, quadrupole sources, etc.
The animations will hopefully explain their characteristics and meaning.


Keywords are :  

      Monopole
      Dipole
      Quadrupole
      Volume source
      Force source

